<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" :checked ="allChange"  @click="allCheckedHandel"/>
    </label>
    <span> <span>已完成{{unm}}</span> / 全部{{ todoList.length }} </span>
    <button class="btn btn-danger" @click="deleteAll">清除已完成任务</button>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  name: "Footer",
  data() {
    return {
      todoList: [],
      unm : 0
    };
  },
  methods:{
    //全选逻辑
    allCheckedHandel(e){
      this.$bus.$emit("allChecked",e)
    },
    //删除已完成逻辑
    deleteAll(){
      this.$bus.$emit("deleteAll",this.deleteAll)
    }
  },
  beforeMount() {
    //获取todoList
    this.$bus.$on("todoList", (todoList) => {
      this.todoList = _.cloneDeep(todoList);
    });
    //获取已完成数量
    this.$bus.$on("finished",(num) => {
      this.unm = num
    });
  },
  computed: {
    allChange() {
      return this.todoList.every(item => item.done ) && this.todoList.length !==0
    },
  },

};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>